Printing telegraph apparatus



Feb. 5, 1935. c. w. SWAN PRINTING TELEGRAPH APPARATUS Fild sept. 9, 1935 5 Sheets-Sheet l INVENTOR CAQL W JWA/V llllll ATTOR EY Feb. 5, 1935. c, w. SWAN 1,989,716

PRINTING TELEGRAPH APPARATUS Filed Sept. 9, 1933 5 Sheets-Sheet 2 F/CRE INVENTOR CAPL W. SWfl/V A'I'I'ORNE Feb. 5, 1935. c. w. SWAN PRINTING TELEGRAPH APPARATUS Filed Sept. 9, 1933 5 Sheets-Sheet 3 INVENTOR C 4P1. VV. JWA/V ATTORN Y Feb. 5, 1935. c. w. SWAN 1,989,716

PRINTING TELEGRAPH APPARATUS Filed Sept. 9, 1933 5 Sheets-Sheet 4 93 L //VE INVENTOR (4E4 W. 51444 Feb. 3, 1935. c. w. SWAN PRINTING TELEGRAPH APPARATUS Filed Sept. 9, 1935 5 Sheets-Sheet 5 Patented Feb. 5, 1935 UNITED STATES PRINTING TELEGRAPH APPARATUS Carl W. Swan, Chicago, Ill., assignor to Teletype Corporation, Chicago, 111., a corporation of Delaware Application September 9, 1933, Serial No. 688,726

21 Claims.

The present invention relates to printing telegraph apparatus and more particularly to improvements in the type of printing telegraph rceivingapparatus wherein the characters are 5 printed upon a tape.

An important object of the present invention is the provision of an interlocking means for efiecting the printing of a previous character while the succeeding character is being selected, to provide an overlap of operations.

Another object of this invention is to provide ribbon feed and automatic ribbon reversing mechanisms for printing telegraph apparatus especially designed for projection purposes.

The above and other objects of the invention are accomplished by the provision of a printing telegraph receiver comprising a six unit code disc selector mechanism of the latch type, in which the code discs are arranged in superposed horizontal planes. The code discs are per-- mutably set by a selector mechanism embodying an overlap whereby the recording of the preceding character occurs during the period a group of code impulses for a succeeding character selection is being printed. Specifically, the selector mechanism, which is similar to that disclosed in S. Morton et al. Patent 1,745,633 of February 4, 1930, is operatively positioned to one side of the code discs, and embodies a single selector electro-magnet directly responsive to line current impulses.

Directly above the code discs and concentrically disposed therewith are the actuating bars, striker disc, and type bars. Arranged around the periphery of the code discs and operatively associated with the actuating bars are a series of selectable elements or drop bars. Printing or recording by the type bars is effected upon a tape through the use of an inking ribbon which extends transversely of the tape at a printing point, the printing zone being located centrally of the circularly arranged type bars. In the specific embodiment disclosed, the type bars are divided into two substantially semicircular groups disposed one on each side of the directional movement of the tape, and the ribbon feed mechanism is positioned outside the area circumscribed by the type bars, the ribbon being directed between the two groups of type bars so as to cross upon itself obliquely and then extend transversely across the tape, the effect of such construction being to provide a compact and efiicient ribbon feed mechanism. The type on each type bar is positioned so as to print on either the near or the far side of the tape to efiect offset printing characteristic of stock quotation operation. However, single line printa ing can be produced, if desired, by positioning thetype faces on the type bars.

Arranged below the above mentioned mechl- 5 nism is the motor and juxtopositioned to the motor and the printing apparatus and operatively connected thereto is the main operating shaft assembly which is disposed vertically.

Many features included in the disclosure of the 10 present application are also disclosed copending application Serial No. 651,664, filed January 14, 1933 by A. H. Reiber et al., and the following copending applications filed September 9, 1933; namely, Serial No. 688,711 filed by H. L. Krum, Serial No. 688,713, filed by W. J. Zenner, and Serial No. 688,730 filed by E. W. F. Hanke et a1. a

A better understanding of the invention may be had from the following description, taken in conjunction with the accompanying drawings, wherein,

Fig. 1 is a perspective view of the printing telegraph apparatus embodying the improvements according to the present invention;

Fig. 2 is a plan view of the apparatus;

Fig. 3 is a vertical cross-sectional view of the apparatus taken on line 3-3 of Fig. 2;

Fig. 4 is a transverse cross-sectional view taken substantially on line 4-4 of Fig. 3, and

Figs. 5, 6, 7, and 8 are views representing details of the ribbon feed and ribbon reverse mechanisms according to the present invention.

Referring to the drawings wherein like reference characters indicate the same part through the several views and more particularly to Figs. 1 and 3, there is shown a main supporting frame generally indicated by the numeral 11, which carries in its lower compartment a motor 12 which is separated from the other parts of the apparatus superposed thereabove by a solid partition. Frame 11 also carries the parts or units; namely, main shaft assembly, the operating mechanism, the selector mechanism, and the typing unit, generally indicated by the numerals 13, 14, 15, and 16, respectively, all of which are arranged vertically so as to produce a compact, self-contained apparatus. The typing unit 16, which carries the ribbon feed and reverse mechanisms and also the tape feed mechanism is, by means of dowels 17 which fit into drilled holes in the main frame 11, detachably mountable on frame 11 so that it may be readily interchangeable, if desired, with a typing unit specially designed for projection purposes.

For a detailed description of the specific apparatus herein shown, reference may be had to copending application Serial No. 651,664, filed January 14, 1933 by A. H. Reiber et a1. Accordingly, only so much of the apparatus willbe described as will be conducive to a ready understanding of thepresent invention. To shaft 21 of motor 12 is secured a worm pinion 22, which is adapted to mesh with worm gear 23 amxed to the lower extremity of a vertically disposed main operating shaft 24, which is carried by anti-friction bearings 25 and 26 which, in turn, are mounted in suitable brackets secured to frame 11. Carried on shaft 24 immediately above bearing 26 is a combination friction and grab clutch 25, the friction clutch portion of which comprises a driving disc 28 interposed between discs of friction material. The fiange 29 of the friction clutch portion of the combination friction and grab clutch 27 is provided on its upper surface with a series of teeth and forms a part of the toothed or grab clutch portion, the companion teeth of this clutch portion being formed on the lower surface of the flange ofa sleeve member 32. Sleeve member 32 is also provided with a flange 33 integral to which is a cam portion 34 which coacts with a cam follower. roller 35 mounted on a stud shaft 36, secured to the frame E1 of the apparatus. Drive disc 28 is operatively connected to sleeve member 32 through laterally disposed arm 37. Disc 28 constantly tends to rotate due to the action of the constantly rotating friction clutch portion thereon, but is prevented from rotating by means of a stop lever 38 (Fig. 1). The teeth on sleeve member 32 are maintained out of engagement with the teeth on flange 29 by means of the camming=out action between cam 34 and follower 35. When the stop arm 38 is moved out of engagement with lug 37 on stop disc 28 as will presently appear, power is communicated by the clutch 2'7 to sotate sleeve 32 until the cam portion 34 passes out of contactual relation with the follower 35, whereupon sleeve 32 will, be urged downwardly due to the distending action of helical spring 39 to effect the meshing of the teeth in the grab clutch portion of the clutch 27. Thereafter a positive driving action is imparted by power communicated through the grab clutch to a multi-cam member 41 disposed above sleeve 32 and rotatively connected through tongue and groove means to sleeve 32. Near the end of the cyclic rotation of the clutch 27, the cam 34 and follower 35 again cooperate to cam out the sleeve member 32 and consequently disengage the toothed portions of the grab clutch. The further rotation during the final period of the cycle is effected solely through the friction clutch portion of clutch 27. Incidentally, cam member 41 is provided with cam grooves to control the printing, tape feed, ribbon feed, and selector bar restoration functions of the apparatus.

Shaft 24 extends above the bearing 25 and is secured to the inner ring of'the anti-friction hear-- ing 25 by means of a nut 42 and lock nut 43. A selector cam assembly 40 is loosely mounted on shaft 24 and comprises a selector cam member 44 which is provided with a series of cam projections or portions 45 which are helically arranged so as to effect, upon rotation of the selector cam member, the operation of a series of selectable members succesively. Cam member 44 also includes 7 a release cam portion 48. The selector cam assembly includes in addition to cam member 44, a locking cam disc.46, and a driving i=9, All

of these cam discs are held in a predetermined cooperative relation with the selector cam assembly by means of a nut 51 and a lock nut 52.

' Threaded into the upper end of shaft 24 and rotatahle therewith is a member 53 which is provided with a flange 54 which forms part of a triotionv clutch 55 comprising drive dis'c 56, discs of friction material 57. and a disc 58 which'is operatively connected by means of tongue and, groove connections to a capstan nut 59 threaded and locked on the upper end of member 53. Compressed between flange 58 and the flange on nut 59 is a helical compression spring 61 which renders the friction clutch effective. Disc 49 and disc 56 are operatively connected to each other by means of a pair of diametricaily opposed lugs 62.

Shaft 24 rotates continuously and carries with it, as previously described, the friction clutch portion of clutch 2'2. with shaft 24 is the member 53 and its associated parts, except'disc member 56 which is held from rotation byfla stop gate 63 (Fig. 1). Thus, it is seen that the selector cam assembly is driven by the shaft 24 through the medium of friction clutch 55 which is rendered effective by the pressure of spring 61.

Having referencenow to 4, the details of the selector mechanism actuated by the aforementioned selector cam assembly will be described. The selector cam assembly is rotated at a speed substantially equivalent or synchronous to the speed of code impulsing, and operating in conjun-c-tion therewith is a selector magnet 65 which may be connected either directly or indirectly to the signal line. 7

Referring to Fig. 3, the selector cam assembly is shown as cooperating with a group of selector elements 66 and a series of code discs 67, detailed illustration of which is shown in Fig. 4. As pre- Also constantly rotating viously described, the code discs 67 are arranged in superposed horizontal planes and are mounted for limited rotation on studs 68, and are held in spaced relation by washers 69 mounted on said studs. In the specific embodiment herein described, the code discs are provided with spokes, but may obviously be formed from solid discs if desired.

The transfer mechanism between the six code discs 67 and the selector arm 71, associated with the selector magnet 55, comprises six sets of selector elements, each set comprising a T-lever 72 (Fig. 4), a selector member or interponent 73, detents 74, and bell crank levers 75, each set being composed of thin, flat material and arranged in superposed relation between guide plates 76 which are mounted on studs 77 and spaced by washers (not shown).

As is commonly known, the peripheries of the code discs are notched so that each permutation of the six discs will result in an alignment of notches to permit the entrance of a selector or drop bar '70 therein. The T-levers '72 are mounted on a common pivot '78, and each one; is provicied at the extremity of its stem portionwith a substantially circular head to fit snugly into a notch in its associated code disc so that the oscillation of a T-lever 72 will effect a corresponding reciprocation of its code disc. Each I-lever 72 is provided in its head portion with 'a hole substantially larger than a common guide rod or stop post 79 so that the limited movement of the T-lever and code discs may be predetermined. The interponents 73 are provided with circular portions 81, adapted to engage corresponding sockets in their associated bell crank levers 75. Individual springs 82 normally hold the bell crank lever 75 and interponents 73 in the position shown in Fig. 4 with one or the other of the abutments 5 83 and 84 in contact with their cooperating abutments and 86 in T-lever 72. Springs 82 are also eflective to hold their corresponding bell crank levers 75 in contact with the lector cam member 44.

As previously mentioned, the selector cam member 44 is provided with a helically arranged series of cams 45, one for each of the bell crank levers 75, which rotate the bell crank levers 75 (six in the present instance) in succession and thus reciprocate the interponents 73 as the selector cam member 44 is rotated. In addition to the reciprocal movement, the interponents 73 have a lateral swinging movement between detent notches 87 which cooperate with detents 74 which are actuated by their individual springs 88.

The setting of an interponent 73 to its righthand or left-hand position is determined by the position of selector arm or lever 71, which in turn is determined by the nature of the signal impulses, whether marking or spacing, received by the selector magnet 65. Selector lever 71 terminates in a U-shaped portion 89, having downwardly extending arms 91 and 92 which constitute abutments which cooperate with abutments 93 and 94 of the interponent 73 and function to position the interponent 73 in either its right-hand or left-hand position, as will presently appear. As previously mentioned, each spring 82 associated with a bell crank lever 75 holds the associated interponent 73 in its forward position and in engagement with its associated T-lever 72, and each code disc 67 thus is held in either one or the other of its two selecting positions according to the position of the associated interponent 73.

As the signal impulses are received, the selector magnet 65, which, in the present embodiment is shown connected directly in the line circuit, responds to only one of the two different electrical conditions comprising the signals, and seizes its armature 95 when a marking impulse is received and releases it again when a spacing impulse is received, while the interponents 73 are reciprocated successively in synchronism with the received signals by the action of selector cams 45 of the cam member 44 upon the bell crank levers 75. The abutments 93 or 94 are thereby brought into cooperative relation with their companion abutments or arms 91 or 92 at the corresponding signal intervals, thereupon setting the interponents 73 in variant combinations. In order to insure the alignment of abutments 91 and 92 in their respective cooperative positions, a limiting stop 96 is provided.

Having reference to Fig. 3, it will be noted that cooperating with the peripheries of code discs 67 are a series of selector or drop bars 70, only one of which is shown in Fig. 3. These bars are circularly arranged about the code discs 67 and are pivotally mounted upon a circular rod 102. The rod 102 is mounted in and the bars 70 are guided by a circular comb member 103. Each of the bars 70 is provided adjacent their pivotal points with a heel portion to which is secured one end of an individual spring 104, the other end of which is secured to a ring 105 attached to the frame of the apparatus. The springs 104 normally tend to rotate their respective bars 70 in a clockwise direction (as viewed in Fig. 3) into ,engagement with the code discs 67. Each of the bars 70 is provided with an arm 106 which cooperates with a selector bar storing member 107. The member 107- is held normally in its upward position, and thus through arm 106 maintains the bars 70 out of engagement with the code bars 671 Member 107 is connected to a lever 108, pivoted at 109 to an adjustable member 111 which is slidably mounted on a bracket 112. The opposite end or lever 108 is provided with a follower roller adapted to coact with one of the cam grooves in cam member 41. Thus, upon the cyclic operation of cam member 41, positive reciprocal movement in a vertical direction is imparted to member 107. Member 107 is slidably mounted on a turret member 113 mounted on a base 114 and concentrically positioned with relation to the code discs 67.

Also slidably operable in the turret member 113 is the reduced lower end of a plunger 114, the upper end of which is guided in a block 115 mounted on .a plate 116 and is disposed in coaxial alignment with turret member 113. Carried by the upper end of plunger 114 is a circular striker member 117 which is provided on its upper surface and along its circumference with a continuous V-shaped notch or groove, and interposed between striker member 117 and an upward extension on bars 70 is an actuating or push bar 118, there being one push bar 118 individual to each selector bar 70. The upper end of push bar 118 is provided with a rack meshed with a segmental gear portion of a type bar 119 associated therewith. Type bars 119 are pivotally mounted on a circular rod 121 carried in a circular comb member 122. Bars 118 are guided by comb members 123 and 124 and are each provided with a spring 125 adapted to simultaneously impart thereto a downward and leftward movement (as viewed in Fig. 4). Each push bar 118 is provided with a notched portion adapted to engage with the.V-shaped notch along the peripheral edge of the striker disc 117 when urged thereto by its associated selector bar 70.

Downward movement is imparted to plunger 114 by a lever 126, pivotally mounted on bracket 112, one end of which operates in a groove in plunger 114, the other end of the lever 126 being provided with a follower roller which operates in a cam groove in the cam member 41. Upward movement is imparted to plunger 114 by a spring actuated lever 127 which is pivoted to a bracket 128 secured to plate 105. One end of lever 127 is adapted to operate on a shoulder in plunger 114 and the other end cooperates with a printing spring 129. The lower end of spring 129 is attached to one end of an adjusting lever, 131, the other end of the lever 131 cooperating with an adjusting screw 132 (Figs. 1 and 3), which makes possible the variation of the printing blow.

Referring to Figs. 1 to 4, a description of the mechanism so far described will now be given. As previously mentioned, the normal stop condition of the line is marking, and hence the selector magnet 65 is normally energized due to which condition the selector arm 71 is held in its counterclockwise or attracted position, as viewed in Fig. 4. During the first line impulse or start interval which is of spacing nature, the selector magnet 65 is deenergized and the movement of the selector lever 71 will effect, through hell crank 133 (Fig. 1), the disengagement of latch 134 from stop gate 63 to permit a single cyclic operation of the selector cam assembly, in a manner clearly set forth in the aforementioned Patent 1,745,633. As described in said patent,

the parts are so constructed that the selector cam assembly is stopped positively by the gate 63 at the end of each cycle, and is readily released in response to a start impulse by the movement of the selector lever 71. In this manner the apparatus of the present invention is adapted to operate on the start-stop principle.

Assuming that the first impulse after the starting impulse is of marking nature, the armature 95 and associated selector lever 71 will be held in their counterclockwise. positions (shown in Fig. 4). While the selector lever 71 is in this posietion,.a locking lever 134 actuatedby previously mentioned cam 46 operates to lock it in such position, as clearly set forth in U. 8. Patent 1,783,382 issued December 2, 1930 to H. L. Krum, until the first cam'of the helical series of cams 45 on the selector cam member 44 has actuated its associated bell crank lever 75 in a counterclockwise direction to move the first interponent 73 to its marking position. This movement of interponent 73 to its marking position, shown in Fig. 4, is effected when interponent 73 is caused to rotate about its ball portion 81 due to the coaction of abutments 91 and 93 and the downward pull exerted on bail portion 81 by the bell crank 75. Interponent 73, when subsequently actuated in a reverse direction by spring 82 through bell crank 75, rocks, through the cooperation of abutments 84 and 86, the associated T-lever 72 to its counterclockwise position, to urge in turn its associated code disc 67 to its corresponding clockwise position.

Had the first impulse condition after starting been of spacing nature, the armature 95 and selector lever 71 would not have been held or attracted by the selector magnet 65, but instead, the lever 71 would have assumed its clockwise position, in which event the opposite abutments to those previously mentioned would have cooperated to move the associated code disc 67 to its counterclockwise position.

The operation of the selector mechanism pursuant to the reception of each of the succeeding impulses, including the stop impulse condition of marking nature, is similar to that just described. At the conclusion of each of the complete cyclical operations of the selector cam member 44, an alignment of notches occurs in the code disc to permit the selection of one of the drop bars 70 to actuate thereby one of the push bars 118 into cooperative relation with striker disc, 117, which,

when operated, imparts an upward movement to bar 118 to cause its associated type bar 119 to be rotated about rod 121 to efi'ect printing.

In operation, an overlap is provided between the selecting operation and the printing operation, the cam 41 being initiated into operation substantially at the termination of the selecting cycle so that the printing of a previous selected character may be effected while a succeeding character is being selected. To effect this overlap, the mechanisms indicated generally by 13 and 18 in Fig. 1 are employed. The selector cam assembly is also provided with a release cam 48 (Fig. 1) which coacts with a release lever 135 pivctally mounted on a shaft 136 carried in the frame of the machine. Lever 135 is provided at one extremity thereof with a cam follower 137 adapted to coact with cam 48. The other arm is provided with a shoulder which cooperates with arm 138 of a release bail 139 freely carried on a vertically disposed shaft 141 suitably mounted in the frame of the apparatus. Lever 135 is held in cooperative engagement with arm 138 by a spring 142. When cam 48 coacts with follower 137, lever 135 is thereby disengaged from arm 138, permitting the release lever 139 to be rotated slightly in a clockwise direction by its spring 143 to effect the disengagement of arm 38 from stop disc 28. Thus, at a predetermined point in the cycle of operation of the selector cam member 44, the

rotation of the cam member 41 is initiated. The

rotation of the cam 41 is positively restricted to a single cycle or revolution by the action of stop lug 37 on disc 28 upon lever arm 144 of release lever 139; the effect of lug 37 on arm 144 being to impart a counterclockwise rotation to release lever 139 to effect the reengagement of arm 138 with lever 135, and consequently the return of arm 38 into the path of lug 37.

Thus it is seen that substantially a complete overlapbetween the selecting operation and the printing and functional operations is provided. The cam 41 and the levers 108 and 126 (Fig. 3) cooperate to effect these operations. Cam 41, after the initiation of its rotation, effects first the counterclockwise movement of lever 108 (as viewed in Fig. 3) to impart to member 107 downward movement whereupon all of the selector bars 101 are free to respond to the action of their individual springs 104 to be rotated about the pivot rod 102 into engagement with the code discs 67. As already disclosed, the operation of the selector mechanism has effected an alignment of notches in the code discs 67, thus permitting one of the selector bars 70 to enter therein, and in consequence thereof the selected bar 70 is permitted to rotate about rod 102 somewhat farther than its companion bars 70, the efiect of which is to move its associated push bar 118 into cooperative relation with the striker member 117. An undercut notch 145 is provided on bar 118 for interlocking engagement thereof with striker 117. At the proper time in the cycle of operations, the lever 126 is rotated in a clockwise direction to permit plunger 114 to respond to the action of printing spring 129 through the instrumentality of lever 127. Plunger 114 and its associated striker disc 117 thus have a sharp upward movement imparted thereto, which movement is imparted through selectively operated push bar 118 to the associated type bar 119, which is rotated sharply to its printing position against a platen 146 (Fig. 3) through the rack and pinion connection between said push bar and said type bar. In this connection the interlocking relation between notch ,145 and the peripheral V-shaped groove on the striker member 117'afiords a positive looking connection between the push bar and the striker member so that immediately upon their interengagement for effecting the printing operation, the drop bars 70 are free to take part in a succeeding selection. Thus, a further overlap within an overlap is provided between the selecting and printing operations to provide thereby a reduction in time required per cycle of operation. It has been shown in practice that this arrangement contributes materially to increasing the speed of operation of the apparatus according to the present invention.

Immediately following the release of the plunger 114 to perform the printing operation, the drop bars 70 therefore may be restored to their released or unactuated position out of engagement with code discs 67. This restoration is effected by imparting a clockwise movement to lever 108 to raise, in turn, the restoration member 107 to its upward position, which member coacts with arms 106 of selector bars or drop bars 70 to rotate said bars 70 against the action of their springs 104. Since the cam 41 is required to overcome the pull of approximately sixty-four springs 104, the fulcrum 109 of lever 108 is so selected as to produce a mechanical advantage of about three to one. Adjustment 111 is provided to control the clearance between bars 70 and code discs 67. Immediately following the retraction of bars 70 from the code discs 67, the re-selection of code discs 67 in accordance with ensuing code combinations may be effected. The plunger is finally returned to its lowermost position by the cam 41 by imparting counterclockwise rotation to lever 126, whereupon clockwise rotation is imparted to lever 127 to store up energy in the printing spring 129 for a subsequent printing operation.

The reciprocation of plunger 114 also functions to operate the tape feed mechanism through a lever 148, but since this feature is not a part of the present invention and inasmuch as there are many well-known methods for accomplishing this result, no specific method will be herein de scribed.

The present invention also provides a positively operating power driven ribbon feed mechanism comprising an automatic ribbon reversing means. As viewed in Fig. 2, a pair of angularly disposed ribbon reels or spools 151 and 152 are provided and are arranged such that the inking ribbon 153 is directed transversely of the tape 154 at the printing point, the effect of which is to permit practically immediate presentation of the printed record to the view of the observer. In the present structure, the ribbon 153 is, by means of a specially constructed ribbon guide 155, substantially as shown in Fig. 2, adapted to cross upon itself obliquely and thence extend transversely across the tape, the guide 155 being secured by Screws 156 to the main frame of the printer, clearance holes for the screws being provided in the tape guide 157.

A centralizing means to guide the tape through the ribbon guide 155 is provided whereby arm 158 of guide 155 is provided, on the edge cooperating with the ribbon, with a curved contour, the eflect of which is to maintain the ribbon centralized with respect to arm 158, and thereby prevent the edges of the ribbon from becoming ravelled or frayed, which would occur if the ribbon were permitted to rub against the end of the slot formed by the elbow of arm 158.

The ribbon reels 151 and 152 are of a form commerically used for typewriters and are rotatively mounted on individual stud shafts 159 (Figs. 2 md 5) integral with ribbon feed ratchets 161 and 162, respectively. Each stud shaft 159 is slit and terminates in a substantially spherical portion, the-purpose of which is to permit the reel to be mounted on the shaft 159 by sliding the reel over the spherical portions, the slit shaft permitting the spherical portion to be compressed to the diameter of the bore of the reel as the reel is slid into place, after which the reel is adapted to rest loosely on the shaft and is prevented from easily becoming detached by means of the spherical end which has again expanded to its normal size, which is substantially larger than the bore of the reel. A driving connection between ratchet 161 and its associated reel is provided by the cooperation of a pin 163 (Fig. 5), integrally formed on the ratchet 161 adjacent the shaft 159, with a hole in the side of reel 151. A similar driving connection is provided between reel 152 and ratchet 162.

Ratchet 161 is aflixed to a shaft 164 iournaled in bearings 165 and 166 (Fig. 2) and is held against endwise movement by a collar 167 pinned to shaft 164. Carried on the shaft 164 between the collar 167 and bearing 166 is a helical compression spring 168 which acts against a washer 169 also carried on said shaft. By means of spring 168, collar 167 is urged against the bearing 165, the effect of which is to provide a frictional drag to prevent ratchet 161 from rotating too freely. Similarly, ratchet 162 is aifixed to a shaft 171 and correspondingly arranged.

Ratchets 161 and 162 are provided on beveled edges thereof with numerous ratchet teeth, and cooperate with a common pawl member 172 (Figs. 5, 6, and 7) which coacts during alternate periods determined by a ribbon reversing mechanism with one or the other of said ratchets. Pawl member 172 is pivotally connected to an operating arm 173 by means of a universal connection 174 (Fig. 8) and is pivotally carried by a bracket 175 (Fig. 3) mounted in the frame of the apparatus. Arm 1'73 coacts with a plunger 176 (Fig. 3) slidably carried in guide 115, which in turn cooperates with operating lever 126; thus, each time the lever 126 is operated to effect the printing function, the ribbon feed operation is simultaneously performed. Through the instrumentality of the universal connection 174, not only is a vertically reciprocating motion imparted to pawl 172 by lever 173, but also an oscillatory movement is imparted periodically to pawl 172 by the ribbon reverse mechanism, as will presently appear.

In the position shown in Fig. 5, pawl 172, when reciprocated vertically, causes ratchet 161 to rotate step-by-step to pull the ribbon from reel 152 and to wind it on reel 151. An automatically operated ribbon reversing means has been provided which is effective when the supply of ribbon from one or the other of reels 151 and 152 has become nearly exhausted. As indicated in Fig. 5, for example, a ribbon reverse bail 177, is provided which is pivotally mounted by means of its laterally disposed arms 178 and 179 to a pair of pivots 181 and 182. Secured to the upper part of bail 177 is a member 183 provided with a pair of ribbon reversing arms, the extremities of which are bifurcated to permit the threading of the inking ribbon therethrough. A rivet 184 is provided near each end of the ribbon so that when the supply of ribbon is nearly exhausted from one or the other of the reels, the ribbon near the end of the ribbon from the exhausted reel will fail to pass through the slit end of the ribbon reversing arm and thereby cause the bail 177 to be rotated about pivots 181 and 182 due to the pull of the opposite reel upon the ribbon.

As shown in Fig. 5, the bail 177 has just been rotated in a clockwise direction by means )1: rivet 184 to a position preparatory to the reversal of operation of the ribbon feed mechanism which is effected in the following manner. Bail 177, upon being rotated clockwise, as previously described, causes foot 185 to be introduced beneath the vertically reciprocating pawl 172, so that upon its next downward stroke, pawl 172 will cooperate with the vertically immovable foot 185 to cause pawl 172 to rotate clockwise (as viewed in Fig. 5) about the universal connection 174 until said pawl engages the teeth on ratchet 162. as shown in Figs. 6 and 7; the vertical reciprocation of pawl 172 being thereafter effective to actuate ratchet 162 until the reversing bail 177 has been operated by the rivet near the opposite end of the ribbon, or that end associated with reel 151, whereupon the bail 177 will be rotated counterclockwise tointroduce foot 186 beneath pawl 172 in like manner and with like result: as previously set forth 1 in connection with foot 185. 2

An adjusting means to secure the proper interaction between pawl 172 and ratchets 161and 162 is provided by the present invention. Having reference to Fig. 2, the plunger 176 is provided with a cap-nut 140 the turning of which on plunger 176 Earies the over-all length of said plunger to control in turn the degree of movement of lever 173 and thereby the extent of reciprocation of pawl '172. This adjustment ofthe length of} plungerf176 is made with respect to ratchet 161; so, having made the adjustment with ratchet 161? it is desirable to effect asimilar adjustment with f the other ratchet 162. It is manifest that the plunger 176 and cap-nut 140 having been ad- 'justed with respect to the ratchet 1613." its ad-' fjustment cannot now be disturbed to'efiect. a,

adjustment "with respect to the other ratchet 162; therefore, to provide for the inde-' pendent adjustment of ratchet 62 the reversing" bail 177 is provided with a member 150 adiustably' 25 related thereto, which member carries integrally "therewith the foot 185, the foot 186 being integral with the main portion of the bail'177. The member 150 is pivoted to the bail 1 17 at 160 and is provided opposite the pivot with a hole 170 sub- 80 stantially larger in size} than the diameter of a clamping screw 18.0 carried by the bail 177. Thus by pivoting member 150 about its pivot 160 a predetermined' amount of vertical adjustment maybe imparted to foot 185, screw 180 serving 35 to clampmemh-er 15.0 to bail 177 after the adjustment has been made, to determine the interaction between pawl 1'12 and ratchet 162, it being tinderstood that the latter adjustment is based iiponthe'extent of movement of lever 17; 40 previoiisly determined by the adjustment 02 W plunger 176. As indicated in Fig. 7, pawl. 172

" is guided by'm'eans of guide members 187 and .7 188, carried in the frame of the machine. j

*2 Arm 178 of bail 177 terminates in a =-J-shaped 45 end adapted to coact with a detent means 189,

i (Fig. 3"), comprising a cap member1913mounted on bracket 192, in which is slidably carried a rod i 193 to one end of which is afiixed a ball 194. Carried on rod 193 is a helical compression spring 50" 195 which normally acts to urge the ball 194 to ward the lefhinto cooperation' with arm 178 of bail member 177. Thebail 17?, upon being actuated to its reversed position {men the completion of each ribbon reversing eperation; is thus maintained thereat through the instrumentalit-y of detent means 189.

Pawl172 is maintained in its actuated position by a detent means which comprises a rocking member 196 loosely mounted on a stud shaft 197 secured to bracket 192 and a spring 198. Rocking member 196 provided with a depending arm 199 at the extremity 01' which is carried a spring 7 post 201 to which is attached one end of the spring 198, the: other end of which is attached to 'a spring postgi202 carried on the pawl member 172. jhe members 172 and 196 are so arranged by means of a slot and pin connection 2031 therebetween that Ywhen pawl 172 assumes its nonnormal intermediate position, said members and spring 198 are in alignment and in a condition of unstable balance or unstable equilibrium, so that the slightest urge upon pawl 172 to one side or the other, as by means of reverse bail 1.77, will disturb this balance and cause the spring 198, which at its intermediate position ,is distended to its fullest extent, to contract and thereby compel movement'of member 196 and pawl 172 to the corresponding side, whereupon pin 202 is no longer aligned with post 201 and pivot 197, but is disposed, for example, to the right thereof (as viewed'in Fig. 5) the tension of spring 198 actuating to time pull 172 toward the ratchet 161. With this arrangement, the action of bail 177, through foot 185 or 186. upon pawl 172 need only be sufflcientto swing pawl 172 up to and slightly beyond the intermediate position, the spring i198 functioning thereafter to carry the pawl member into engagement with the ratchet 181 or 162. The movement of member 196 is limited bythe arms 205 and 206 thereof cooperating with pivot studs 207 and 208, so that upon the oscillation of mem- 1 gagement with ratchetdfil or 162, as the case may be. In actual operation, of course, the'pawl .172

is swung directly fronr one operative position to the other by-bail 177, the unstable central or intermediate position being merely a passing condition as the pawl172 moves to eitherv side.

Cooperating with pawl 172 and pivotally. I

mounted on st lids 207 and 208 are a pair of check pawls 209 and 211 to which rotation in opposite directions is irnparted by a spring 212 common thereto, as clearly shown in Figs. 5, 6, and 7. The function of the check pawls 209 and 211 is to prevent the back-slipping or back-lashing of the operated ratchet 161 or 162 during the rapidly reciprecating movement of pawl 172. Each of the check pawls 209 and 211 is provided with an equivalency of the claims are 'therefore intended to be embraced therein. What is claimed isff 1. In a printing telegraph receiver comprising a plurality of verticaliy disposed type bars, a corresponding plurality ;of actuating bars therefor,

a plurality oi selector members arranged in superposed horizontal planes and in operative relation with said actuating bars, a series of selectable elements positioned around the periphery of said seiector members, said actuating bars arranged to be interpositioned between said membersfand said type bars, an electromagnetic 15elector mechanism responsive to current impuises for operating said members to select one of said elements, means cooperating with a selected element to effect the operation of. its associated bar, and means to prevent the disassociatior; of

said means and said selected actuating bar during the type bar operation. f

' 2. In a telegraph receiver, a pluraiity of code discs arranged in superposed horizontal planes,

a series of selectable members arranged around the periphery of said code discs, a corresponding series of actuating bars operatively related to said members, an electromagnetic selector mechanism responsive to current inipulses for operating said discs, means cooperating with said members to eflect the operation of its associated bar, and

interlocking means to prevent the disassociation of said means and said bar during the operation oi saidbar.

3. In a telegraph receiver, a plurality of selectable bars, a plurality ofselector members arranged in operative relation tosaid bars, a type bar and an actuating bar therefor associated with each se lectable bar, said actuating bar interposed between its associated type bar and selectable bar, an electromagnetic selector mechanism responsive to current impulses for operating said members to select one of said selectable bars, and means including interlocking means operated following the selection of the selectable bar for efiecting through the associated actuating bar the operation of the associated type bar, said means comprising means whereby said members may be reoperatedby said selector mechanism to effect a succeeding selection while the previously selected type bar is operated in accordance with the previous selection. a

4. In a printing telegraph receiver, a plurality of vertical type bars movable in printing toward a common center in planes which all intersect on a common axis, printing means for said type bars; a plurality of selectable bars corresponding to said type bars, a selector mechanism comprising a magnet responsive to current impulses and means to selectively condition said selectable bars for operation, means controlled by said selector mechanism to operate said printing means to effectuate the recording operation, and means associated with said printing means and adapted for the efiectuation of a succeeding selection of said selectable bars while the previously selected type bar is operated in accordance with the previous selection.

5. In a telegraph recorder, a plurality of pivoted type bars, a plurality of actuating bars, one for each of said type bars, a corresponding plurality of selectable elements for controlling said actuating bars each having an operating and a non-operating position, a single magnet selector mechanism responsiveto current impulses for controlling the operative positionment of said selectable elements, means operated following the selection of any one of said elements for efiecting, through the instrumentality of said actuating bars, recordation, and means to prevent the disassociation of said means and a selected actuating bar during the recording operation.

6. In a telegraph device, printing mechanism, a pair of angularly disposed ribbon carriers cooperatively related to said mechanism, a ribbon advancing mechanism comprising a swingable member common to both carriers, a ribbon actuated means, and signal-controlled power-driven means cooperative with said ribbon actuated means for automatically associating said member alternately with each of said pair of carriers.

7. In a telegraph device, printing mechanism, a pair of angularly disposed ribbon carriers cooperatively related to said mechanism, a ribbon advancing mechanism comprising a swingable member common to both carriers, a ribbon actuated means, and signalcontrolled power-driven means effective with said ribbon actuated means upon the exhaustion of the ribbon from either carrier for automatically associating said member with-the other carrier.

8. In a telegraph printer, a selecting mechanism, printing mechanism controlled by said se lecting mechanism, a ribbon-feed mechanism comprising a pair of angularly disposed ribbon carriers each provided on its periphery with a series of teeth, a shiftable reversing bail disposed between said carriers, means for operating said bail reciprocatively in response to each operation of said printing mechanism to coact with either one or the other of said series of teeth to eflect' the movement of the ribbon from one carrier to the other, and means cooperative with said printing mechanism and efiective upon the exhaustion of the ribbon from either carrier for automatically reversing the directional movement of said ribbon.

9. In a telegraph printer, printing mechanism, a ribbon-feed mechanism comprising a pair of angularly disposed ribbon carriers each provided onits periphery with a series of teeth, a shiitable reversing bailv disposed between said carriers, means for operating said bail reciprocatively in response to each operation of said printing mechanism to coact with either one or the other of said series of teeth to efiect the movement of the ribbon from one carrier to the other, a ribbon actuated means, signal-controlled power-driven means effective, through said operating means, with said ribbon actuated means upon the exhaustion of the ribbon from either carrier for automatically reversing the directional movement of sa1 d rib. bon, and overcentering means to urge said bail to its shifted position and to maintain it thereat.

10. In a telegraph printer, printing mechanism, a ribbon-feed mechanism comprising a pair of angularly disposed ribbon carriers each provided on its periphery with a series of teeth, a shiftable reversing bail disposed between said carriers, means to operate said bail reciprocatively in response to each operation of said printing mechanism to coact with either one or the other of said series of teeth to effect the movement of the rib bon from one carrier to the other, a pair of spring actuated detent pawls for said carriers each adapted to be rendered effective or ineffective in accordance with the operation of said bail, a ribbon actuated means, and signal-controlled powerdriven means effective, through said operating means, with said ribbon actuated means upon the exhaustion of the ribbon from either carrier for automatically reversing the movement of said ribbon.

l1. In a telegraph device, printing mechanism, a pair of ribbon carriers cooperatively related to said mechanism, a ribbon advancing mechanism common to both carriers, means for operating said mechanism reciprocatively in response to each operation of said printing mechanism, a ribbon actuated means, and signal controlled power driven means effective, through said operating means, with said ribbon actuated means upon the exhaustion of the ribbon from either carrier to effectuate automatically a reversal of action of said ribbon advancing mechanism.

12. In a telegraph device, printing mechanism, a pair of angularly disposed ribbon carriers cooperatively related to said mechanism, a ribbon advancing mechanism comprising a shiftable reversing bail common to both carriers, means for operating said bail reciprocatively in response to each operation of said printing mechanism, means controlled by said ribbon advancing mechanism to control a reversal of action of said ball on said carriers, and signal-controlled powerdriven means cooperable, through said operating means, with said last recited means to eflectuate said reversal of action.

13. In combination in a telegraph printer, 8.

plurality of vertical series or members, each series comprising a drop bar, an actuating bar and a type bar superposed respectively one above the other, and circularly arranged, code disc selector means for selectively determining the vertical series to be operated, means to effect printing immediately subsequent to the selection of. a drop bar, and interlocking means adapted for the reselection of a drop bar during the printing operation according to the previous selection.

14. In a printing telegraph receiver comprising a plurality of type bars, a corresponding plurality ofactuating bars therefor, a plurality of selector members arranged in operative relation with said actuating bars, a series of selectable elements operatively associated with said selector members, said actuating bars arranged to be interpositioned between said members and said type bars, a single magnet selector mechanism responsive to current impulses foroperating said members to select one of said elements, means cooperating with a selected element to effect the operation of its associated type bar, and means members arranged in operative relation with said actuating bars, a series of selectable elements operatively associated with said.selector members, ,said actuating bars arranged to be interpositioned between said members and said type bars, a single magnet selector mechanism responsive to current impulses for operating said members to select one of said elements, means cooperating with a selected element to eflfect the operation of its associated type bar, and means to prevent the disassociation of said means and said selected actuating bar during the type bar operation.

16. In a telegraph receiver, a single-magnet code-disc selector mechanism, a series of selectable members operatively associated with said code discs, 9. corresponding series of actuating bars operatively associated with said members, means cooperating with said members to effect the operation'of its associated bar, and means adapted for the reoperation of the selector members during the operation of the previously selected actuating bar.

17. In a telegraph receiver, a plurality of selectable bars, a plurality of selector members arranged in operative relation to said bars, a type bar and an actuating bar therefor associated with I each selectable bar, said actuating bar interposed between its associated type bar and selectable bar, a single magnet selector mechanism responsive to current impulses for operating said. members to select one of said selectable bars, means cooperating with a selected selectable bar to effect the operation of its associated type bar, and means adapted for the reoperation of the selector members during the operation oi the previously selected type bar.

18. In a telegraph printer, a selecting mechanism, printing mechanism controlled by said selecting mechanism, a ribbon-feed mechanism comprising a pair of angularly disposed ribbon carriers and a common feed member swingable therebetween, and a ribbon actuated means adapts ed to control the coactivity of said member and said carriers to control in turn the reversal of action of said ribbon-feed mechanism, said means adapted upon one operation of said printing mechanism to condition said ribbon-feed mechanism for reversal and upon a succeeding operation of said printing mechanismto consummate thereversal of said ribbon-feed mechanism.

19. In a telegraph device, printing mechanism, a pair of angularly disposed ribbon carriers cooperatively related to said mechanism, a ribbon advancing mechanism comprising a swingable member common to both carriers, a ribbon actuated means, signal-controlled power-driven means cooperative with said ribbon actuated means for automatically associating said member alternately with each of said pair of carriers, a pair of detent pawls for said carriers, and a single spring means to render said pair of pawls constantlycoactive with said swingable member whereby each of said pair of pawls is adapted to be-rendered eflective or inefiective in accordance with the-operation of said swingable member.

20. In a telegraph device, printing mechanism. a pair of angularly disposed ribbon carriers cooperatively related to saidmechanism, a ribbon advancing mechanism comprising a swingable member common to both carriers, a ribbon actuated means, signal-controlled power-driven means cooperative with said ribbon actuated means for automatically associating saidmember alternately with each of said pair of carriers, 8. pair of detent pawls for said carriers, a single spring means to render said pair of pawls constantly coactive. with said swingable member whereby each of said pair of pawls is adapted to be rendered eflfective or ineifective in accordance with the operation of said swingable member, and overcentering means to urge said swingable member to its shifted position and to maintain it thereat. f

21. In a telegraph device, printing mechanism, a pair of angularly disposed ribbon carriers 

